Screw driver

Details Screw driver Screw driver

1996-02-29

1997-09-23

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81439, B25B 2300

Patent

active

056692730

ABSTRACT:
A spanner type screw driver comprises a spanner device, a bit and a first and second rivets. The spanner device has a first spanner and a second spanner. The first spanner has a first hexagonal hole on the first head portion of the first spanner. The second spanner has a second hexagonal hole on the second head portion of the second spanner. The first hexagonal hole has six blunt corners. The second hexagonal hole has six blunt corners also. A tapered recess is disposed on the first hexagonal hole. A tapered recess is disposed on the second hexagonal hole. An elastic retaining ring is disposed on the tapered recesses. The first and second spanners are fastened together by rivets. The screw driver bit is inserted in the first hexagonal hole, the retaining ring and the second hexagonal hole.

REFERENCES:
patent: 3590895 (1971-07-01), Wirtanen
patent: 5528963 (1996-06-01), Wei

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